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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f6ee35d811c73b38120fcad2e60227f0c3cf60cb0f3df47720ed8d3466a3b8' 
  AND token = 'bbA8TiloZD1vCubOdzkybvzVF3arMpsmCOK1DiIa/Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}